The latest articles on DEV Community by Sabrina (@sabrina). https://dev.to/sabrina https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F846873%2F0ca7e4f7-8222-4342-b258-2d6e6bbfbd78.jpeg https://dev.to/sabrina en Sabrina Wed, 13 Apr 2022 14:24:34 +0000 https://dev.to/sabrina/c-random-4489 https://dev.to/sabrina/c-random-4489 <h2> the definition of rand() &amp; srand() </h2> <p><code>rand(): generate random numbers in the range [0, RAND_MAX).<br> srand(): Set Seed for rand() Function. Standard practice is to use the result of a call to srand(time (0)) as the seed.</code><br> Notes: If random numbers are generated with rand() without first calling srand(), your program will create the same sequence of numbers each time it runs.</p> <h2> how to generate a random number in the fixed range </h2> <p><code>int a = rand() % 10; //[0,9]<br> int b = rand() % 10 + 5; //[5,14]<br> int c = rand() % (upper-lower+1) + lower; //[lower,upper]</code></p>